b'STEEL O-RING FACE SEAL ADAPTERS(BUNA-N O-RING STANDARD)BUNA-NO-RING LOCKFace Seal NUTSteel O-Ring Face Seal Fittings (ORFS):Steel O-ring face seal adapterttings usePART No.ORFSDIA. PART No. ORFS a straight thread and have a machinedS3931R-49/16 - 18.301 S3931N-4 9/16 - 18 .groove in the face of the maletting toS3931R-611/16 - 16 364 S3931N-611/16 - 16 accept an O-ring (of either Buna N or VitonS3931R-813/16 - 16 489 S3931N-8 . 13/16 - 16 material). This O-ring is compressed againstS3931R-101 - 14 614 S3931N-10 1 - 14.theat face of the femaletting for a leakS3931R-121-3/16 - 12 739 S3931N-121-3/16 - 12.proof connection, and offers excellent leakS3931R-161-7/16 - 12 926 S3931N-161-7/16 - 12. protection at high pressures. S3931R-201-11/16 - 121.176STEEL MERCHANT PIPE FITTINGS (Weldable)COUPLING COUPLING(Half Height)PART No.Pipe BI-103MC-A1/8 PART No.Pipe BI-103MC-B1/4 BI-103HMC-A1/8BI-103MC-C3/8 BI-103HMC-B1/4BI-103MC-D1/2 BI-103HMC-C3/8BI-103MC-E3/4 BI-103HMC-D1/2BI-103MC-H1 BI-103HMC-E3/4BI-103MC-J1-1/4 BI-103HMC-H1BI-103MC-K1-1/2 BI-103HMC-J1-1/4BI-103MC-M2 BI-103HMC-K1-1/2BI-103MC-N2-1/2 BI-103HMC-M2BI-103MC-P3BI-103MC-S4PLUG(Square Head)BUSHING PART No.PipeBI-109MC-A1/8 PART No.PipeBI-109MC-B1/4 BI-110MC-CB3/8 to 1/4BI-109MC-C3/8 BI-110MC-DB1/2 to 1/4BI-109MC-D1/2 BI-110MC-DC1/2 to 3/8 BI-109MC-E3/4 BI-110MC-ED3/4 to 1/2 BI-109MC-H152'